We're going to solve 1387 multiplied by 2900
1387 × 2900 = 2900 × (1387)
+ 2900 × 7 yielding 20300
+ 2900 × 80 that results in 232000
+ 2900 × 300 resulting in 870000
+ 2900 × 1000 what gives us 2900000

= 4022300
